Re: [PATCH 1/2] mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()

Hello,

On Thu, Nov 07, 2019 at 01:21:25PM +0100, Michal Hocko wrote:

Hmm, how can we have a task in an offline memcg? I thought that any existing task will prevent cgroup removal from proceeding. Is this some sort of race where the task managed to disassociate from the cgroup while there is still a binding to a memcg existing? What am I missing?

The previous cgroup one was from bsd process accounting which happens after the process is marked head. This one IIUC is from core dumping path.

Thanks.